@Cangot: Hi, I'm using ExtJS 4.1, can you please help me to understand how did you accomplish this semi pie chart with a needle. I have rendered a pie chart with a donut but not able to find out how to draw a semi pie chart and a needle.

Looks like this is a full chart with one data item representing 50% and the color set to the same as the background with a needle image overlayed. I need a chart like this too but I don't want all that wasted white space.

@mitchellsimoens How can we do a half pie chart in ExtJS? I need a Gauge chart without the axes and a label on each field. Already 3 users have asked if there is a way to do this, I hope someone can help.

Edit: This thread should be moved from Sencha Touch 1.x (unsupported) to Ext JS 4.x forum.

Edit 2: I've found how to create a Gauge chart without axes and a label on each field, so I will share the solution if it can help other users.
For the axes, I override the drawAxis function with an empty function and for the series, I override the drawSeries function, based on the Gauge drawSeries function and add me.calcMiddle(item); after rendererAttributes.segment and me.renderLabels(); before delete me.value. Adding onCreateLabel and onPlaceLabel functions from the Pie chart is also necessary.